How are the earth's principal biological system being depleted
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Mr. Lester R. Brown has pointed out that there are four principal biological systems of the earth.
They are
1. fisheries
2. forests
3.Grasslands
4.croplands
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☆ They supply our food and provide raw materials for industry except minerals.
☆ But man’s demands on these systems are reaching an unsustainable level. Overfishing is very common.
☆ Local forests are disappearing to provide firewood and wood. The world is losing 40 to 50 million acres of forests a year.
They are
1. fisheries
2. forests
3.Grasslands
4.croplands
--------
☆ They supply our food and provide raw materials for industry except minerals.
☆ But man’s demands on these systems are reaching an unsustainable level. Overfishing is very common.
☆ Local forests are disappearing to provide firewood and wood. The world is losing 40 to 50 million acres of forests a year.
suzain4:
thank u soo much
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